Engine Status And Engine Speed (Rpm)

Fig 1: Identifying Engine Status And Engine Speed (RPM) Function

Courtesy of VOLVO CARS CORPORATION

The engine control module (ECM) (4/46) provides information about engine status and engine speed via the controller area network (CAN). This information is used to activate the pump motor when the engine is started.

Vehicles equipped with the function automatic start/stop of engine will also use the information from Engine control module (ECM) and Central electronic module (CEM) (4/56) to decide if the vehicle is in position autostop.

If the vehicle is in position autostop, the pump motor will be deactivated. The pump motor is reactivated when the engine is started again.